Nuftu.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/Counters.sol";

/**
 *
 */
contract Nuftu is Context, ERC721Enumerable, ERC721Burnable {
    using Counters for Counters.Counter;

    address private _creator;

    Counters.Counter private _tokenIdTracker;

    string private _baseTokenURI;

    /**
     * Token URIs will be autogenerated based on `baseURI` and their token IDs.
     * See {ERC721-tokenURI}.
     */
    constructor(string memory baseTokenURI) ERC721("Nuftu NFT", "NUFTU") {
        _baseTokenURI = baseTokenURI;
        _creator = _msgSender();
    }

    function _baseURI() internal view virtual override returns (string memory) {
        return _baseTokenURI;
    }

    /**
     * @dev Creates a new token for `to`. Its token ID will be automatically
     * assigned (and available on the emitted {IERC721-Transfer} event), and the token
     * URI autogenerated based on the base URI passed at construction.
     *
     * See {ERC721-_mint}.
     *
     * Requirements:
     *
     * - the caller must be the creator.
     */
    function mint(address to) public virtual returns (uint256) {
        require(_creator == _msgSender(), "Nuftu: must be creator to mint");

        // We cannot just use balanceOf to create the new tokenId because tokens
        // can be burned (destroyed), so we need a separate counter.
        uint256 tokenId = _tokenIdTracker.current();
        _mint(to, tokenId);
        _tokenIdTracker.increment();
        _approve(_msgSender(), tokenId);
        return tokenId;
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual override(ERC721, ERC721Enumerable) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, ERC721Enumerable) returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}